What is the purpose of taping a chest wound dressing on three sides?

What is the purpose of taping a chest wound dressing on three sides?

• A. To completely seal the wound
• B. To allow air to escape from the chest
• C. To apply constant pressure
• D. To prevent contamination

Answer: (B)

Taping the dressing on three sides creates a flutter valve that vents air out of the chest but doesn’t seal it airtight. As air escapes during exhalation, the opening is effectively closed off on inhalation, preventing air from being sucked back into the pleural space. This reduces the risk of a tension pneumothorax from a chest wound. Fully sealing the wound would trap air and worsen the problem, so the three-sided approach balances drainage with safety by acting as a one-way valve.

Taping the dressing on three sides creates a flutter valve that vents air out of the chest but doesn’t seal it airtight. As air escapes during exhalation, the opening is effectively closed off on inhalation, preventing air from being sucked back into the pleural space. This reduces the risk of a tension pneumothorax from a chest wound. Fully sealing the wound would trap air and worsen the problem, so the three-sided approach balances drainage with safety by acting as a one-way valve.